Phase 3IEC

Arc Flash Incident Energy Calculator

IEEE 1584-2018 / NFPA 70E / IEC 62271

Calculate arc flash incident energy, hazard risk category (HRC), arc flash boundary, and required PPE for electrical equipment. Used for arc flash labels and safety studies.

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Results are for guidance only. All calculations must be verified by a qualified electrical engineer before implementation. Always refer to the applicable local standard and authority having jurisdiction.

This calculator provides an estimate using simplified methods. A complete arc flash study requires full power system data, protective device coordination, and must be performed by a qualified engineer per IEEE 1584-2018.

Standard:

System Data

kV

e.g. 0.415 for 415V, 11 for 11kV

kA

From short circuit study

mm

455mm for LV switchgear (NFPA 70E default)

ms

Total clearing time including relay + breaker

mm

Conductor gap: 32mm LV switchgear, 13mm MCC

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